在Bazel中，可以通过--java_toolchain参数设置Java编译工具链，然后通过--javacopts参数来传递对Java编译的更多控制选项。在这种情况下，可以使用-A选项来传递注解处理器参数。

假设注解处理器的名称为MyAnnotationProcessor，模式导出目录为/path/to/schema/export/directory，可以使用以下Bazel构建规则：

java_library(
    name = "my_library",
    srcs = ["MyClass.java"],
    deps = [...],
    annotations = [
        "@com_google_auto_value_auto_value//:auto-value",
        "//path/to/my/annotation:my_annotation",
    ],
    exports = [
        "//path/to/schema/export/directory",
    ],
    visibility = ["//visibility:public"],
)

java_plugin(
    name = "my_annotation_processor",
    processor_class = "com.example.MyAnnotationProcessor",
    deps = [
        "//some/dependency:foo",
    ],
)

java_binary(
    name = "my_binary",
    srcs = ["Main.java"],
    deps = [
        "//:my_library",
    ],
    main_class = "com.example.Main",
    java_toolchain = "@bazel_tools//tools/jdk:current_java_toolchain",
    args = [
        "-processor",
        "MyAnnotationProcessor",
        "-Aroom.export_dir=/path/to/schema/export/directory",
        # Other javac options can be passed here as well
    ],
)

以上构建规则中的-Aroom.export_dir=/path/to/schema/export/directory即为设置注解处理器参数的选项，其中room.export_dir为Room数据库库的注解参数。

在这个示例中，MyAnnotationProcessor的process()方法将检查指定目录/path/to/schema/export/directory以导出架构文件。